How to use Single sign On in CRM2007 ?

Dear All,

I have created a launch transaction for launching ransactions from R3 (using BOR).

Now, the problem is when I click on the link in WebUI it gives me a popup for entering R3 User Id and only then it allows navigation to R3 transaction.

How do I remove this popup ? I want that since user has already eneterd password for WebUI it should further not prompt him/her for the password. How to achieve this ?

Can we use Single Sign on ? How ?

Regards,

Ashish